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  #1   IP: 207.81.177.73
Old 12-19-2007, 03:57 AM
Overspendin' Overspendin' is offline
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The ideal prop for a C30?

As you may know via catalinathirty.com, I'm in the middle of a serious refit.
I'd like suggestions for the ideal non-feathering prop for an A4 powered C30.
I currently run a 12 x 7 two bladed prop which I find almost acceptable.
the boat is used primarily for day sailing or cruising.
I've recently located to a small yacht club near my home that usually has serious wind
and current issues to deal with when docking, not to mention prop-walk.
I'm not overly concened with drag, but I'd like to get as much oomph as I can...ideas?
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  #2   IP: 69.26.119.135
Old 12-19-2007, 10:41 AM
jayw jayw is offline
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I contacted Michigan Wheel and filled out their form for prop selection: http://www.michiganwheel.com/MIWheel...is/InboOne.asp and then emailed one of their tech people who were very helpful in figuring out how I had used the form incorrectly. I'm very pleased with the 3-blade prop that they recommended for my A4 with a reduction gear.
If I had a direct drive A4, I would contact Indigo www.atomic4.com/ to inquire about their 3-blade prop.
Prop walk is an issue with my Bristol 35.

Last edited by jayw; 12-19-2007 at 10:44 AM.
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  #3   IP: 71.16.159.194
Old 12-19-2007, 11:20 AM
Jesse Delanoy Jesse Delanoy is offline
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I have the Indigo three-blade prop on my Catalina 30, and I'm very satisfied with it. Much less prop walk and much easier maneuvering in reverse than with my prior two-blade prop.
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  #4   IP: 206.125.176.3
Old 11-19-2008, 02:30 PM
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sastanley sastanley is offline
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Question old thread!

Hi Jesse,

Since I know you still frequent the A4 board, I hope you'll see this.

What is your latest thoughts on the Indigo prop a year after this post?

My concerns are drag (i am a racer at heart!!) and still like to cruise fast

Does it all the RPM to get up more than an overpitched/sized two-blade?

Although down on my priority list quite a bit, I have been thinking about a prop change if it is useful at the higher end of the motoring spectrum, possibly the CDI...and more information without spending any money is always useful!
Thanks!
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-Shawn
"Twice Around" - '77 Catalina 30, #511 with original A-4 & MMI manifold.
She is always happy with a clean bottom!

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  #5   IP: 71.16.159.194
Old 11-19-2008, 03:14 PM
Jesse Delanoy Jesse Delanoy is offline
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Shawn,

I've had the Indigo 3-bladed prop for several years now, and I'm still satisfied with it. I haven't noticed any additional drag from when I had a larger, two bladed prop, and in fact I think I recall seeing a spec that indicated that the Indigo does not increase drag materially (or perhaps not at all). It's a fair bit smaller in diameter than the old two-bladed prop, so that makes up for the extra blade somewhat.
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  #6   IP: 64.231.11.237
Old 11-19-2008, 04:33 PM
Dave O Dave O is offline
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By co-incidence I just ordered an Indigo prop yesterday after checking any number of threads and suggestions on this board and others. Ultimately I decided that Indigo was probably the best bet for me and we'll see in the spring.

My principal concern did not have to do with drag but in the back-and-forth with the Indigo people they mentioned this:

I do not have any hard data with regard to drag. I do know that when you compare the frontal area of our 3 blade prop with a standard 12" diameter two blade "Sailor" prop, our prop has about 8% more area. You will see a little more difference yet. Having said that, I do not think you will be able to perceive the difference. If you were going from a folding prop to ours, probably you would notice the difference.
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